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129 lines
3.5 KiB
C
129 lines
3.5 KiB
C
/* Work around the bug in some systems whereby stat/lstat succeeds when
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given the zero-length file name argument. The stat/lstat from SunOS4.1.4
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has this bug.
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Copyright (C) 1997-2003 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* written by Jim Meyering */
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#include <config.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#ifndef errno
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extern int errno;
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#endif
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#ifdef LSTAT
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# include <string.h>
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# if HAVE_STDLIB_H
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# include <stdlib.h>
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# endif
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# ifdef STAT_MACROS_BROKEN
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# undef S_ISLNK
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# endif
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# ifndef S_ISLNK
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# ifdef S_IFLNK
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# define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
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# else
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# define S_ISLNK(m) 0
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# endif
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# endif
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# ifndef HAVE_DECL_FREE
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"this configure-time declaration test was not run"
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# endif
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# if !HAVE_DECL_FREE
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void free ();
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# endif
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# include "xalloc.h"
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/* lstat works differently on Linux and Solaris systems. POSIX (see
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`pathname resolution' in the glossary) requires that programs like `ls'
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take into consideration the fact that FILE has a trailing slash when
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FILE is a symbolic link. On Linux systems, the lstat function already
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has the desired semantics (in treating `lstat("symlink/",sbuf)' just like
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`lstat("symlink/.",sbuf)', but on Solaris it does not.
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If FILE has a trailing slash and specifies a symbolic link,
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then append a `.' to FILE and call lstat a second time. */
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static int
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slash_aware_lstat (const char *file, struct stat *sbuf)
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{
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size_t len;
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char *new_file;
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int lstat_result = lstat (file, sbuf);
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if (lstat_result != 0 || !S_ISLNK (sbuf->st_mode))
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return lstat_result;
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len = strlen (file);
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if (file[len - 1] != '/')
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return lstat_result;
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/* FILE refers to a symbolic link and the name ends with a slash.
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Append a `.' to FILE and repeat the lstat call. */
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/* Add one for the `.' we'll append, and one more for the trailing NUL. */
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new_file = xmalloc (len + 1 + 1);
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memcpy (new_file, file, len);
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new_file[len] = '.';
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new_file[len + 1] = 0;
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lstat_result = lstat (new_file, sbuf);
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free (new_file);
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return lstat_result;
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}
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#endif /* LSTAT */
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/* This is a wrapper for stat/lstat.
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If FILE is the empty string, fail with errno == ENOENT.
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Otherwise, return the result of calling the real stat/lstat.
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This works around the bug in some systems whereby stat/lstat succeeds when
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given the zero-length file name argument. The stat/lstat from SunOS4.1.4
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has this bug. */
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/* This function also provides a version of lstat with consistent semantics
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when FILE specifies a symbolic link and has a trailing slash. */
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#ifdef LSTAT
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# define rpl_xstat rpl_lstat
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# define xstat_return_val(F, S) slash_aware_lstat (F, S)
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#else
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# define rpl_xstat rpl_stat
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# define xstat_return_val(F, S) stat (F, S)
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#endif
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int
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rpl_xstat (const char *file, struct stat *sbuf)
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{
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if (file && *file == 0)
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{
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errno = ENOENT;
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return -1;
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}
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return xstat_return_val (file, sbuf);
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}
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